Ok, now I understand what you’re saying.
I have to admit that I haven’t studied up on how the new version saves (“RX document” it’s called I believe). But off the top of my head I’d say that if you need to have the process saved in order to go back and tweak it then hitting ‘save’ before sending back should do the trick. Of course you’re then left with two potential problems; 1: Will reopening the file be cumbersome, and 2: Will a reopened file be the one automatically sent back to Nuendo that second time around…?
Like I hinted at above I’ve resigned myself -for now- to “commit” changes in Nuendo/RX. I simply will choose what degree of processing to do in RX and then forget about it having been done, counting on either being able to recreate it quickly or it being done right the first time.